Control mechanism for concrete paving machines



Sept. 22, 1931. E. 1.. TRANAAS 1,824,580

CONTROL MECHANISM FOR CONCRETE PAVING "MACHINES Filed Dec. 10. 1929"I-Shgets-Shet 1 [MENTOR Sept. 22, 1931. a. L. TRANAAS 1,324,530

CONTROL MECHANISM FOR CONCRETE PAVIKG MACHINES Filed Dec. 10, 1929 7Sheets-Sheet 2 Ti Ej- -9, 46- I IN MEN 70R EfiJiWS ATT ORN EY5 Sept. 22,1931. E. L. TRANAAS 1,824,530

CONTROL MECHANISM FOR CONCRETE PAVING MACHINES Filed Dec. 10, 1929 '7Sheets-Sheet 3 Sept. 22, 1931. E. TRANAAS, 1,824,580

CONTROL MECHANISM FOR CONCRETE PAVING MACHINES Filed Dec. 10, 1929 7Sheets-Sheet 4 Sept. 22, 1931-. 5.1.. TRANAAs 1,824,580

CONTROL MECHANISM FOR CONCRETE PAVING MACHINES Filed Dec. 10. 1929 7Sheets-Sheet; 5

wri/vro/e BY 23: 1, fi'ms Q I": d A, I, I6 I I ATTORNEYS E. L. TRANAAS1,824,580

CONTROL MECHANISM FOR CONCRETE PAVING MACHINES Sept. 22, 1931.

Filed Dec. 10. '1929 7 Sheets-Sheet 6 l/VVENTOR Sept. 22, 1931.

CONTROL MECHANISK FOR CONCRETE PAVING MACHINES Filed Dec. 10. 1929 7Sheets-She'et 7 j 45- 56 o O 21a .93 5 i: 3/ o 0 356 5. E I

If 0 /9 l5 E. L. TRANAAS 1,824,580

. Patented Sept. 1931 or MILWAUKEE, Wisconsin, ASSIGNOB r'o iron-nameEMIL I. TBANAAS,

1mm; OFFICE COMPANY,

OF MILWAUKEE, WISCONSIN, A CORPORATION conrnor. nn'cmmsu non concnn'mravmc mciaznms Application filed December 10, 1029; Serial No. 413,029.

crete mixed bythemixer, acharging skip or' device for elevating thecombmed aggregates to charge them into the mixer, and suitable timecontrolling means determining the discharge action of the machine.

The purpose of the invention is to carry forward by way of improvementsand spe- 1'5 cial controls intermediate the various parts of themachine, the inventions embodied in Robb Patents No. 1,370,497 of March1st,

1921 and No. 1,660,301- of February. 21st,

1928, and Webb Patent No. 1,628,378 of May '10th, 1927, the last patentincluding particularly a special automatic discharge control mechanismfor improving that part of the machine embodied in Robb Patent No. v1,370,497, aforesaid.

N ow in the operation of machines for paving-purposes of the typereferred to, certain interlocking or cooperative-sequential operationsof the various mixing, chargin and discharging instrumentalities aredesirable. Again, the overlapping of the operating times of certainoperations is necessary as is presented in the Robb Patent No.1,660,301.

Improved devices for obtaining these results are the subject matter ofthis invention, and

- anisms so that they will not work in automatic succession, or withautomatic overlapped actions, are nowprovided. O

In carrying outthis invefition,.the machine has been-designed to affordwhat may be called a full automatic operation performing a fullautomatic cycle to the extent that the action of the u'ward movement ofthe p trol mechanisms of the machine such that skip, u on charging,starts what is known as the liatchmet'er time control into action andcauses the subsequent proper timed op- '-erations of the dischargingdevice of themixing drum, and the later actuation of the skip orcharging devicecontrol to'raise the skip to I. lits cliarging'positionand thus complete'said additional devices for controlling the mech--automatic cycle, the supplying of water to the mixing drum for mixingwith the dry aggregates being taken care of by the skip operation, ashas been previously roposed 1n Y the prior art patents'lierein re erredto.

In the further carrying out of the invention, the'full automatic cyclejust above mentioned may be discontinued by operation of a manualcontrolled instrumentality to the extent of placing the skip raisingmovement for charging action under the control of the operator. I

Likewise, the automatic cycle above outlined is susceptible ofmodification by a manual operator, control of the discharge of the mixerwhich is a power driven ty e of discharge, an instrumentality beingmterposed so that if desired, a manual operation of the power dischargemay be employed. However, provisions are made so that this manualcontrol cannot be called upon or put intoaction at any time whentheautomatic cycle has been started to the extent of placing the control ofthe discharge under the action of the batchmeter timin device.

Another phase of the invention is vinvolved inthat portion of thecontrol operationv in which the power discharge chute mechanism isplaced under manual control so that the 1 discharge chute may undercertain condi tions be moved to discharging or non-dischargingpositions. When this control is established by the action of properinstrumentalities the operator has withinhis power to hook upthe'discharge action of the chute power discharge for the mixer with theautomatic means for initiating the raising movement of the chargingskip. He need A not necessarily interlock these two actions becauseprovisions are made so that the hook up may be effected or not effected.

A manual provision is made in the conthe automaticinstrumentalitiesmaybe incapacitated to actually cause an operation of the powerdischarge to effect discharging of the mixer, in which. event theseinstru mentalities will merely serve to unlock the power discharge toplace it under the manual control which has been suggested above as oneof the features of the invention.

Specifically new instrumentalities are employed for causin the movementof the power discharge ute to non-dischargingposition, if it bepreviously in a discharging position, invariably efiected under theaction of the raising of the skip to charge.

, chided means such that whenthe discharge chute is in non-dischargingposition, it wlll not .be controlled-or caused to move to a dischargeposition under any circumstances by the rising action of the skip. Inother words, the purpose of the invention in this aspect is to maintainthe discharge chute under absolute control to move to dischargingosition as a part of the function of the batc meter timing controldevice, or under manual control when said chute is not controlled by thebatchmeter. But never is it desired to ermit the rising movement of theskip to e ect a discharging action of the discharge chute.

This invention also involves certain other features of construction andoperation in charge casing, showing certain o in? the positlon whichthey occupy during one way or another, related to the foregoingfeatures, and which will appear more fully as this description proceeds.

For a full and more complete understand: ing of the invention referencemayhad to the following description and accompanying drawings,'inwhichigure 1 1s a side elevation of the concrete paving machine showingmy invention applied thereto, a portion of the distributing boom and thesk1p being broken away and the skip shown in charging position in full.lines and receiving position in dotted lines.

Figure 2 is a fragmentary enlarged elevation of the discharge end of thepaver showing the connection between the power discharge unit and thedischarge chute for the mixing drum. p

Figure 3 is a vertical, sectional view through the power dischargecasing, certain, of the parts being broken away and shown in section,the release mechanism beeased position in dotted lines. Figure 4 is asectional view taken approximately on line 44of Figure 3, 100 mg in thedirection of the arrows.

igure 5 it an endview-of thepower discharge, parts of the casing beingbroken away to show more clearly certain details of the internalmechanism, i Figure 6 ,is a diagrammatic sectional view through theupper portion of the fpower disthe parts the mixingcycle of thepaver.

shown in set position in full lines and;

Figure 7 is a diagrammatic view similar to Flgure 6, showing thebatchmeter control release lever cammed out of operating position,showin the parts in mixing cycle position in full ines and showing theparts at the end of the mixin cycle when the batchmeter has tripped o indotted lines.

Figure 8 is a diagrammatic plan view of the skip hoist lever push rodactuating mechanism.

Figure 9 is a horizontal sectional view showing the power discharge pushrod for actuating the skip hoist lever and the shiftable pin forconnecting the power discharge with the skip hoist lever.

Figure 10is av diagrammatic perspective view of the skip hoist levermounting and the skip actuated mechanismfor the power discharge releaselever.

Figure 11 is a vertical sectional view taken approximatelyon line 11-11of Figure 9, showing the skip hoist lever retractable pin in engagingposition in full lines and isengage posltion in dotted lines.

Figure 12 is a view similar to Figure 11, showing a modified form of theinvention wherein the ski hoist lever is normally disengaged withrelation tothe power discharge pushrod assembly and must be manuallyengaged to cause automatic engage; merit of the skip hoist clutch, thedotted lines of the figure showing the manually actuated foot leverindepr'essed position;

Figure 13 is a somewhat dlagrammatic showing of the operating parts ofthe ower 100 discharge as shown in'Figure 3, disc osing the manual meansfor rendering the batchmeter ineffective to operate the power discharge,certain of the parts and the casing being omitted for the sake ofclearness.

'- Geneml features of- 'machrine Like reference characters refer to.like parts in the several figures of the drawings.

A representsthe traction support on 1-10 which is mounted the frame B.The skip C is pivoted at D to the frame and is adapted in one of itsositions to receive aggregates to be mixe and elevated to discharge theaggregates into the mixing drum which is 'revolvabl carried within theframe B. A boom F ispivotally supported by the frame B at the rear ofthe machine and carries the spreading'bucket G which receives theaggregates after they have been 1% mixed in the inixing druxn'E. Adischarge 1 ychute H is ivotally supported by thev frame B and is aaptedto be' swung into discharging position at theen'd of 'th e' mixing'period by the power discharge mechanism I, forming a partof myinvention. 4

A batchmeter J of the usual type is rovided which controls the. mixingperio of. the aggregates within the mixing drum.

I The frame earriesthe engine housing K,

within which is located the power plant for supplyin operating power tothe machine.

The sha t L, operated by the engine, car- 1,451,483 of April 10th, 1923.

lever P. The lever Power discharge The power discharge mechanism now tobe described may be of different types and the specific deviceswhichconncct the actual power instrumentalitie's with the dischargechute of the mixer form the basis of a separate application for patentand will, therefore, be very generally referred to below. The powerdischarge mechanism itself, as hereinafter set forth however, forms apart of the present invention.

vReferring to Figure 2 of the drawings, it will be noted that a shaft 17extends out of the power discharge case I and carries the crank Naffixed thereto, to which crank is attached a link 0 at one end, theother end of the link bein secured to a T-shaped is secured to the linkQ, connected to the off-standing arm R of the discharge chute H.'Reference is now made to Figures 1,3, 5, 6 and 7 for an understanding ofthe mechanical parts within the power discharge casing.

The internal mechanism just mentioned,

I in the casing I, is arranged to shift the crank N throughan-arc of 180degrees and this action through the linkage O, P and Q causes thedischarge chute H to move either to nondischarging positionas shown inFigure 2, or discharging position in which it inclines oppositely andpermits the materials mixed in the drum E to flow out of the same intothe distributing bucket G.

Figures 3, 4, 13 and 5 perhaps show the parts within the casing I tobest advantage. At the top of the casing I is mounted thebatchinetenoperated lever 1, connected with the batchmeter aswill'belater described and pivoted to be rocked on the casing'I upwardly anddownwardly, upwardly when the batehmeter is to release the mechanism tocausethe discharge chute to assume a discharging position; downwardly,when the batchmeteris reset preliminary to a subsequentrelease actionfor causing the discharge of the mixer. \The lever 1 is carried by asleeve 2 shown in dotted lines in Figure 5 and similarly in Figure 3asloose upon the shaft-41. On the shaft 41 is car'- ried the fixed arm42 which pivotally supports near its upper end, the latch bar3 .g

ving an abutment or shoulder 4 arranged to engageand rock the bell crankrelease lever 5. The lever 5 has its left arm equipped with a lock lug 6movable into and out of engagement with a horizontal detent lever 7pivoted in the casing. The detent lever 7 is adapted to en age at. itsfree end, the upperend of the cIutch engaging lever 8, and said clutchengaging lever is pivoted at its lower end at 8a in the casing, and isprovided with an off-standing arm'8b normally acted upon by the upwardexpansive acwith the detent 8b underneath which the spring 9 is seated.In effect, therefore, the rollers 10 and the lever 8 rock together, saidrollers engaging the thrust disc 11 which is mounted slidably upon theshaft 14, said thrust disc being cooperative with the discs 12 of amultiple disc clutch device to establish a driving relationbetween thedriving sleeve 13 and the driven shaft 14 which supports said thrustdisc. The driving sleeve 13 is designed to be constantly driven by anysuitable connection with the driving shaft L which has previously beenreferred to and to this'end thesleeve 13 has a driven clutch member 13a.

The shaft 14 has keyed thereon a pinion 15 which meshes with the pinion16 fixedly carried by the hollow shaft 17. The crank N is secured to theouter end of the hollow with the pinion 19 secured to the thrust disc11. The thrust disc 11 and the pinion 19 are fixed with respect to'eaehother but are loosely carried by the, shaft 14. The

thrust disc 11 has diametrically opposite depressions 20 arranged inalignment with the rollers 10 to permit the rollers to relieve thepressure on the multiple disc clutch when the.

lever 8 is-latched to the left, as shown in full lines in Figure 3. Alatch member 21 is pivotally carried by the casing and is adapted todrop into the diametrically opposite notches 22 between the flangedextensions 23 of the gear 16, see Figures 3 and 4. This latch member isadapted to holdthe gear 16 and the crank N in mixing or dischargingposition. As the lever 8 is released by the rocking of the bell crank 5,andthe spring 9 rocks. this lever to the dotted line position in Figure3, a push rod 24 above the arm 8?) ear 16 to rotate. With the parts inthe dotted line position,

is actuated to-lift the'latch 21, permitting the the shaft 17 carryingthe gear 16, this shaft drives the pinion 18 which in turn rotates thethrust disc 11 and pinion 19 and an inclined wall 19' leading fromthe'base of depressions 20 in the disc 11, camsthe lever 8 to the left,permitting the latch 21 to be lowered by gravity and the down pressingspring 21a whereupon it will ride on the flanged periphery of the pinion16 until the next notch 21 is reached when the latch will drop into theopposite notch 22 and stop rotation of-the chute operating shaft 17;Gaming of the lever 8 to the left will permit the lever 7 to bedepressed under the influence of the spring 25 which will allow the bellcrank 15 to swing into latching relation with respect to the lever 7 Asthe latch bar'3 is lowered to shift the bell crank 5, cam member 3 onthe bar 3 moves this bar to the rightby coaction with a shaft 46, tothereby disengage it from the bell crank after the bell crank is movedsulficiently to release the lever 7.

When thesrollers 10, associatedwith the lever 8, have moved out of thedepressions 20, they ride on the thick portion of the thrust lever 8.abuts with the detent lever 7 which thereafter supports the rollersslightly out of engagement with the base of the depressions 20, thusrelieving pressure on the disc 11. and clutch discs 12. At this'time,also, the latch member 21 engages one of the notches 22 to arrest themovement of .the crank N.

The foregoing briefly sets forth the action of controlling 180 degreemovements of the crank actuating shaft 17,- and thereby controllingthemovement of the discharge chute either from its discharging positionto nondischarging position, or vice versa.

Skip operating cm ttrol from power discharge mechanism Referring now. toFigure 8 and also Figures 3 to 7 of the drawings, it is notable that theobject now to be accomplished is the operation of the clutchinstrumentalities by which the hoisting means for the skip C are throwninto action to raise the skip, through the medium of the power dischargemechanism hereinbefore set forth. With this in mind the descriptionproceeds. 4

The pinion 16 carries on the opposite side from the notched flangedportion a cam 26.

This cam has two functions First, it is the actuating means for a pushrod 27 operating the hand lever 51, which throws in the skip hoistclutch, and second, it actuates a crooked I lever 28, see Figures 6 and7, to move the forked lever 29 to the right to swing the knock-out bar3a out of, the path of the bell crank release lever 5. The" bar 3aoperates in a manner similar to the latch bar 3, but this bar 311 isunder the control of the skip.

Thus in the ordinary'operation of the machine, in a full automaticcycle, it is contemplated that the cam 26 of the pinion 16 shall causethe rising movement of the skip C. Figure 6 shows the pinion 16 with thecam 26; also Figures 7 and 8. It will be apparent, therefore, that at a"predetermined time in the rotation of the gear 16 in the power dischargeoperation, as the chute is turned I from the non-discharging todischarging position, the cam. 26' will act on the roller 48 carried bythe push rod 27 and hung on a horizontal arm 56 of the shaft 57, seeFigure 8. In this manner,"the cam 26 forces the push rod 27'rearwardas-see'n in Figures 6 to 8, and since the push rod 27 isattached to a rigid arm 50 on the clutch lever rocker 1 shaft 50a, by ayielding connection, seen best in Figures 9 and 19, as the'spring means49, the clutch mechanism for causing the operation of the skip C to risewill. go into action.

. It is desired, as previously stated, to incapacitate the skip, so faras its raising operation is concerned, to have any effect upon the powerdischarge mechanismexcept only in the event that the power dischargechute happens to be in discharging position when the skip goes up. a

With the foregoing in mind therefore, and referring to Figure 10, thereare shown provisions such that the upward movement of the skip cannotaffect the action of the power discharge mechanism to cause it tooperate,

and in this connection see also Figures 6 and 7. In Figure 10 there isillustrated at 30 a roller abutment member supported by an arm fixed tothe pivot axis 31 supporting the skip C. The said arm 30 is cooperativewith an abutment arm 32 on a stub-shaft 33 which in turn carries arocker arm 34, spring retracted in action, the rocker arm 34 beingconnected by a rod 35 with a bell crank lever 36.

The lever 36 is journaled on a stub shaft 36a projecting from the lowerportion of the casing I and said lever 36 is furthermore connected by arod 37 extending upwardly and attached to an arm 38 supported by a shaft39 which is slightly above the shaft 41 carrying the batchmetercontrolled lever 1. The connections just mentioned place under thecontrol of the rising movement of the skip, the rocking of the shaft 39and this shaft 39 carries an arm 40 supporting the short knockout bar3a'which has been previously referred to as arranged to connect withthebell crank release lever 5. Normally the knockout bar.

3a is above the bell crank release lever 5 and capable of rocking thelever5 to release the detent lever 7 and therefore release the 5 clutchengaging lever 8. This knockout bar 3a is norma ly arranged-to actuatethe lever 5 so as to make sure that on the upward movement of the skipif the dischar e chute is at its dischar 'ngposition, it wi be returned1 to its nonscharging position. Since, however, it is not desired tohave the knockout bar 3a act upon the arts 5 and 7 in the above manner,if the disc arge chute is already in its non-discharging position, thecam 26 will under such a condition be so adjusted that it will act uponthe lower crooked 'end of the crooked lever 28 and will have shiftedsaid lever to the right, as seen in Figure 6, thereby causing thefloating link 29 attached'to said 2 lever 28 to abut with and swing to,the ri ht the knockout bar 3a into such a position t at the bar eventho'later swung downwardly by the normal operation of the partssupporting same, will be inefiective and'will not in any way disturb thead'ustment ofthe discharge chute because of ailure of the ower dischargemechanism to act upon suc chute.

I Manual control to operate discharge chute We have seen that thedischarge chute may be caused to operate first by the ,batchmeteractuation of the lever 1 and downward movement of the latch bar 3;secondly, by the operation of the knockout bar 3a controlled 85 by theskip when the chute is in its discharging position as the skip movesupward. There is a third control of this discharge chute action which ismanual and is de endent upon the movement of a foot peda 43, seen in 40Fi ure 5, and in Figure 1,- which foot pedal is xed with the shaft 41 ofthe upper portion-of the casing I, said shaft 41 sing the axis of thesleeve shaft 2'that carries the lever 1 and also the axis of the arm 42.

I Obviously, if the foot pedal 43 is depressedi it will rock the shaft41 and cause a thir knockoutbar '35 seen best in Figure 3, to movedownwardly and thereby tn the release lever 5.so as to release the clutcengag- 5 ing lever 8 and permit the clutch devices 12 s and 13 to gointo action to efiect a 180 degree movement of. the shaft 17 'andits armN, The foot pedal action just described is therefore simple and may' -berformed at all times except when the hate eter has taken control, so tospeak, of the power discharge mechanism. e

Under the last condition, that is during the time'period that thebatchmeter is gov- 6 erning the action of the ower discharge mechanism,the latch bar 3 IS in the position of Figure 6, wherein the toe 44 ofthe latch 'bar isbeneath the right hand end of the bell crank releaselever. 5. Obviously .under this condition, it is impossible for the footsaid lever at the end of t -the .allow the foot pedal 43 to take-controlof the away from the batchmeter 1 control is established. But afterthe;batchmeter has completed its period,

'tion be immediately charge of the drum.

pedal to" depress its knockout bar 35 to rock the lever 5 suflicientlyto effect a release of the detent lever 7 so that the power dischargechute operating clutch is maintained inoperative by the foot pedalaction as previously outlined.

Each'of the parts 3, 3a and 35 has a cam 3' formed upon its inner edgearranged to slide against the shaft 46 to thereby upon downward movementof the particular part having such cam, cause the part to be swunoutwardly from a point above the right han end of the crank lever 5disengaging from he operating .stroke of the parts 3, 3a or 3b, andleaving the lever 5 and associated parts controlling the clutch, lever 8in a condition to be normalized by means previously described.

4, I show a hand lever 45 as carried outside the casing I and fixed tothe shaft 46 previously described. The shaft 46 has a semicircular cam47 fixed thereto within the easing, see Figure 4 particularly, and byswinging the lever 45 in one direction the cam 47 acts on the latch bar3 to shift this latch bar rearward as seen in Figure 7 whereby it isinefiective to depress or rock the lever 5 and virtually incapacitateit-so far as afiecting the clutch lever 8 is concerned. Since the latchbar 3 establishes the control between the batchmeter' and the clutchengaginglever 8, obviously when the parts are ad usted as in Figure 7the batchmeter is powerless to trip the power discharge mechanism intoaction to operate the chute. Even under the conditions just stated,however, where theparts are as in Figures '7 and 13, the toe 44 of thelatch bar 3 still remains in a position beneath the ri ht hand end ofthe lever 5 and prevents. a s cient amount of downward movementof theright arm ofthe lever 5 to disengage the abutment portion 6 of the leftarm of the lever from the ,detent lever 7 Later when the batchmeterperforms its release operation at the end of the mixing Ill period, thelatch bar 3 will move down as in dotted lines in Fi ure 7Vand render thepower dischar the foot al43.' e

.The reason for the above cooperation of parts is that never is itpermissible to power discharge once the batchmeter control action at theend'of a it issometimes dedred that the discharge chute though turnedover to discharge p061 'canbe mec anism controllable. from nevmt dis- 4'done readily,owing to the above interlocking of control, and of course,when the batchmeter is not hooked up by its controlof the powerdischarge mechanism, the foot lever 43 is free at any time to takecharge of the tion, the upward movement of t e sk p C would be compelledunless some provision were made to prevent this which rlngs us to themechanism for the latter purpose, and

for the general urpose of enabling a man-' ual control of t e upwardmovement of the skilp at any time should it be desired. e

ber resiliently .connected to the rod 27 by' ferring again to Figures 9,10 and 11,

there has been described already the action of the rod 27 by which theshort rocker mems ring 49', may actuated from the cam 26.

he rocker lever 50 is freely mounted upon the shaft50a alongside anauxiliary or complemental rocker lever 51a which directly carries thehand lever 51 previously mentioned. The lever structure 51, 51a is con-=nected to throw'the clutch yoke lever 51?) of rod 51f isdirectlyattached to a lever 51g of theclutch and brake unit previouslyinentioned, the action of which-is known and conventional.

With the parts just referred to in mind,

the. problem of this mechanism being described is merely to connect ordisconnect .the push rod 27 operatively in relation to the'clutch and.brake unit and especially the clutch feature of the latter. To this end,there is employed amanual control device that is shown best in Figure 11as comprising a locking pin 52 normally spring pressed by a spring 53and mounted -upon tlie lower part of the lever structure 51, 51a. 'Thepin 52 normally extends intoth e path of movement} of the rocker lever50 as effected under the 'movementof the rod 27, see Figure 9, and whenso extending or projected, obviously the lever structure 51, 51a will berocked by the movement of the part 50. This will communicate to theclutch means a clutchingoperation initiated from the rod 27, thelatterin turn dperated at a certain time in the operation-of the powerdischarge mechanism including the parts 16 and 26.,

Specifically this operation takes place when position .to the discharginposition so t at the operation of raising t e skip C for charging. themixer is compelled-to overlap the operation of emptying the mixing drumof, its contents by means of the discharge chute H.

Under the foregoing conditions the action of the skip C to move upwardlyis part of a normal automatic cycle of the machine but it ma be desiredat times not to have the skip rise to charge the mixing drum under theautomatic control of the power discharge mechanism. The skip might notbe loaded, or if loaded from a truck, the truck 7 51a, said lever 54being fixed by a set screw 'to the lock pin 53. Thus as the lever 54 isturned, its cam 54a will act to retract the p1n52 from a position in thepath ofmovement of the rocker lever 50 and thereupon if the fpowerdischarge mechanism operates to shi the push rod 27 there will be nothrowing in of the skip hoist clutch by the clutch yoke lever 51b, andno upwardmovement of the skip will automatically ensue.

The manual lever 54 is formed with a cam extension 540 which by asufiicient movement of the lever 54 may be turned to engage the fixedbracket structure 54d of the machine and by the impinging action of thecam 546' the lever structure 51', 51a is positively held. in a positionwith the skip hoist clutch disengaged a'nd the skip bracket 510previously referred to rendered operative so that the skip will beositively heldin any desired elevated positlon and locked from beinglowered until these manually controlled parts are released. It should benoted at this time that the pin 52 would be held out of engagement withthe rocker lever 50, and therefore, incapacitated for any action fromthe power discharge mechanism. 1

The reason for providing the spring 49 is' to be specially noted,because by its use, if

the operator should suddenly observe that the skip C whileunderautomatic control of the power discharge, should not be elevated. tocharge the mixer, he may quickly grasp the automatic cycle ofoperationto this extent, the spring 49 in these circumstances merely becomingcompressed and the rod 27 zlading through its bearing in the rockerlever as a means to doing, the pin 52' will be forced. into the (pathrSkz'p rising action nomautonwtz'c There is provided according to Figure12 aconstruction in which the upward movement of the skip of the machineis not a part of the automatic cycle of operation as hereinbefore setforth. That is to say, the clutch mechanism including the part 516 knownas the skip hoist clutch, is normally not susceptible of bein actuatedautomatically from the power disc arge and must be rendered operativeunder the control of said discharge by a manual intervention.

, To this end, according to Figure 12,the lockin pin 52 previous y setforth, is normally held out of engagement with respect.

to the path of movement of the rocker lever 50 by means of the spring53. ,Thus the power discharge may operate as much as it will, and noaction is compelled on the part of the skip hoist clutch means. Butthere is provided a manual lever 58, preferably foot operated which theoperator of the machine may depress any time he wishes and by so ofmovement of the rocker lever 50' an the power for causin the skip hoistclutch to be thrown in, will e now transmitted to the lever structurewhich comprises the. parts 51a and 51 which hre like those previouslydescribed.

In the construction of Figure 12, the lever 54 is adapted to act in anobvious manner ositivel lock the foot lever 58 from being gepresse andwhenthe lever 54'- is so adjusted, it is not ossible for the skip C tobe raised by the action of the power discharge, and through anydepression of the lever 58.

In all constructions of my machine as above proposed, it is evident thatthe operation of the skip C is always under the control of.the lever 51,thisbeinga highlydesirable feature because of possibilities arising thatthe skip G should not be raised due to the upsprmging of a peculiarcondition occurring in the practical use of the machine.

In accordance with this invention, "it is contemplated to supply waterto the mixing drum from a suitabletank or source of supply. From thecycle of operation of the machine, furthermore, t 0 water suppl isturned on to cause water 0 pass into t e mixing drum as an incident tothe upward movement of the skip. The water is caused to pass to the drumuntil the amount required is therein, after which the valve' is turnedoff when the skip descends.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent of the United States, is

1. In apaving machine, in combination, a concrete mixer, chargin meanstherefor, di chargin means there or, power operated means or actuatingsaid eharging'and discausing it to act after a predetermined mixingperiod, power mechanism under the control of they batchmeter fordirectly operatiw the discharging device, a connection operated by saidpower mechanism for initiating the operation of the charging device andnormally inoperative, and means manually to render said last mentionedconnection active.-

3. Ina concrete paving machine, a concrete mixer, a charging devicetherefor, a discharging device therefor, a single power unit,connections between the power unit and the discharging and chargingdevices for the actuation of the latter, and separate means associatedwith the power unit and the charging means for setting said power unitinto action, said means beinginitiated into operation b the chargingmeans.

4. Iii

a concrete paving machine, a concrete mixer, a charging devicethe'refor',a dischargmg device therefor, a power unit, means operativelyassociated w1th said charging device to be operated thereby forautomatically setting said power unit into -act-ion, the power unitincluding a driving member, connections from the driving member to thedischarge device and to the'charging device, and means for resetting theparts of the power unit for "a subsequent operation when said power unitis set into actlon to cause operations of the charging device anddischarging device. v 5. In a paving machine, in comb1nat1on, a concretemlxer, a discharge device therefor, a

eharging'devie therefor, apower unit comprising a dr ving member, anoperating connection forinitia ting charging action of the chargingdevice leading from said driving member and'normally inactive withrespect to the operation of the driving member, means manually to rendersaid connection active to initiate operation of the charging device bythe driving member, and means for setting the power unit into action.

6. In a paving machine, in combination, a concrete mixer, a. dischargedevlce therefor,

- a charging device therefor, a power unit comprising a driving, member,abatchmeter,

means between the batchmete'r and said driv-- ing member for setting thelatter into operation a manual 7 means separate from the III batchmeterfor setting the driving member into action and connections vleading fromthe driving member to the discharging device for the operation of thelatter.

7 In a paving machine, in combination, a

concrete mixer, a discharge device therefor, a Y

charging device therefor, a power unit comprlsmg a drivlng member, abatchmeter,

. means between the batchmeter and said drivtion and connections leadingfrom the driving member to the discharging device for the operation ofthe latter, and means whereby the action of the driving member, may becaused to initiate the operation of the charging device and normallyinactive, together with means manually to render the said last mentionedmeans active.-

8. In a paving machine, in combination, a concrete mixer, a dischargingdevice therefor, a charging device therefor, a power driving member, anoperating connection between the power driving member and the chargingdevice for causing operation of the discharging device ur der a certaincondition, and means to prevent operation of the discharging device bythe charging device under other conditions.

9. In a paving machine, in combination, a concrete mixer, a dischargingdevice therefor, a charging device therefor, a power driv-- ing member,an operating connection between the power driving member and thecharging device for causing operation of the discharging device under acertain condition, means to prevent operation of the discharging devicebyflthe charging device under other conditions and a batchmeter timingdevice cooperating with the power driving memberto cause operation ofthe discharging device after apredetermined time period.

10. In a'pavingmachine, in combination, a

concrete mixer, a discharging device therefor, a charging devicetherefor, a single powerdriving unit, means intermediate the charglngdevice, and said power driving unit to cause the dischargingdevice to beoperated to i assume non-discharging position when the charging'deviceis operated to'charge' the mixer, and means to prevent operationof thedischarging device by the charging device when said discharging deviceis in non-discharging position. I

11. In a pavlng mach1ne,a-n combination, a concrete mixer, a dlschargingdevice there-' for, a charging device therefor, a power dI'iV',

ing unit, means intermediate the charging device and said power drivingunit to cause the power unit to operate the discharging device causingthe same to assume non-discharging position when the charging device isoperated'to charge the mixer, means whereby the charging device isrendered normally in inoperative relation to' the operation of the powerdriving unit and therefore incapable of operating the latter, and meansmanually to render sa1d charging device operative relatively to thepower driving unit.

' 12. In a paving machine, in combination, a concrete mixer,avdischarging device therefor, a charging device therefor, a owerdrivingunit,means to'operate the disc ar e chute from said unit, means tooperate thec arging device from said unit, means operable from thecharging device to set the power drive unit into operation for thepurpose of actuating the discharging device, an instrumentality forpreventing the charging device from causing the power unit to operatethe discharging device when said discharging device is innon-discharging position.

13. In a paving machine, in combination, a concrete mlxer, a dischargingdevice therefor, a charging device therefor, a power driving unit,connections from the power driving unit for the actuation of thedischarging device and for the actuation of the char ing device, aninstrumentality cooperating etween the charging device and said powerdriving unit for causing the unit to operate the discharge device duringcharging action of the charging device, and another instrumentalityrendered operable when the charging evice is doing its charging work tocause the discharging device to move from a discharging position into anon-discharging position, and means manually to render the conditionbetweenthe power driving unit and the charg ing device active, so thatthe operation of the power driving unit may initiate a charging movementof the charging device.

15. In a paving machine, in combination,

a concrete mixer, a discharging device therefor, a charging devicetherefor, a sin le power driving unit for operating the dischar e deviceand the charging device, and a hate meter controlled by the chargingdevice and in turncontrolling the operation of the pow- .er drivingunit.

16. In a paving machine, in combination, a concrete mixer, a dischargingdevice therefor, a charging device vtherefor, a .power drivingunit-comprising a clutch controlling device for starting the drivingaction of the unit, connections from the pbwer driving unit to thedischarging device and the charging device for the operation of theseparts, a detent lever for normally maintaining the a, concrete mixer, adischar clutch controlling device so that the power driving unit isinactive and a: batchmeter connected with the power driving unit torelease said detent an render the unit active.

17. In a paving machine, in combination, a concrete mixer, a dischar 'ngdevice therefor, a charging device t erefor, a power driving unitcomprising a clutch controlling device for starting the driving actionof the unit, connections from the power driving unit to the dischargingdevice and the charging device for the operation of these parts, adetent lever for normally maintaining the clutch controlling device sothat the power driving unit is inactive and a batchmet'er connected withthe powerdriving unit to release said detent and render the unit active,and means controlled by the char ing device for releasing the saiddetent an thus rendering the power unit active.

18. In a paving machine, in combination, g device there for, a chargingdevice t erefor, a power driving unit comprising a clutch controllingdevicefor starting the driving action of the unit, connections from thepower driving unit to the discharging device and the charging device forthe operation of theselparts, a detent lever for normally maintainingthe clutch controlling device so that the power driving unit is inactiveand'a batchmeter connected with the power driving unit to release saiddetent and render the unit active, and means controlled by the chargingdevice for releasing, the said detent and. thus rendering the power unitactive, the power unit,

' comprising a part cooperating with the last mentioned means so as toprevent at certain, tunes the charging unit from releasing said tobecome active. v 19. In a paving machine, in combination, a concretemixer, a discharging device therefor, a charging device therefor, apower driving unit comprising a clutch controlling device for startingthe driving action of the unit, connections from the power driving unitto the discharging device and the charging device for the operation ofthese parts, a detent lever for normally maintaining the clutchcontrolling device so that the power driving unit is inactive and abatchmeter connected with the power driving unit-to release said detentand render ,the unit' active, means controlled by the charging devicefor releasing the saiddetent and thus rendering the power unit active,and a manual device operable to directly'release the detent and renderthe power driving unit active.

20. In a paving machine, in combinatibn,

a concrete mixer,'a discharging device therefor, a charging devicetherefor, apower driving unit comprising a clutch controlling vice forstarting the driving action 0 e deth unit, connections from the powerunit to the discharging device and the charging'device for the operationof these parts a detent lever for normally maintain ng clutchcontrolling device so that the power driving unit is inactive and abatchmeter connected with the power driving unit'to release said detentand render the unit active, means controlled b the charging device forreleasing the said etent and thus rendering a concrete mixer, a.-discharging device there-- for, a charging device therefor, a ower unitcomprising a clutch for connecting a constantly driving part therewithso as to drive the power unit, a detent for normally maintaining saidclutch disengaged, a batchmeter,

a connection from the batchmeter including a latch bar for releasingthedetent and causing the clutch to become engaged to set the power unitinto operation, and means operated from the power unit when it is setinto action adapted to cause operation of the I charging device. '22. Ina paving machine, in combination, a

, concrete mixer, a discharging device there for, a charging devicetherefor, a wer unit comprising a clutch for connecting a constantlydriving part therewith so as to drive the power unit, a detent fornormally mam- Qtainmg said clutch disengaged, a batchmeter, detent andcausing thepower driving unit a connection from the batchmeter includinga latch bar for releasing the detent and caus- -ing the clutch tobecomeenga ed to set the with the power unit, instrumentalities wherebythe manual device on operation ma also release the-detent coacting withthe c utch, andconnecting means between the charging device including aninstrumentality for causing release of said detent at a certain time inthe operation of the charging device.

23. In a paving machine, in combination, a concrete mlxer, a dischargingdevice therefor, a charging device therefor, a power unit comprising aclutch for connecting a constantly driving part therewith so as to drivethe ower unit, a detent for normally maintaining said clutch disen aged,a batchmeter, a connection from the atchmeter including a latch bar forreleasing the detent and causing the clutch to become enfaged to set the(power unit intooperation, an means operate from the power. unit when itisset intoaction adaptiao ' means between the charging device includindetent at a certain time in the an instrumentality for causing releaseof sai ration of the charging device, means where y theoperatinginstrumentality between the charging device and the said detentcannot be actuated to cause release of the. detent when the batchmetercontrivances for the same purpose are set to control the detent,together with other means which prevents the manual device fromoperating the detent under the same condition of control of the detentwhen the batchmeter is set:

24. In a concrete paving machine, comprising a concrete mlxer, acharging device and a discharging device together with a batchmeter forcontrolling the o eration of the discharging device, a power riving unitcomprising a normally constantly rotating part, driving gearing, aclutch for connecting said constantly driven part to the gear: ing, aclutch lever, a spring tending to move said clutch lever to engage theclutch, a detent for normally holding the clutch disenga'ged, and aconnection between the batchmeter and said detent for releasing thelatter at a predetermined time. p

25. In a concrete paving machine, comprising a concrete mixer, a charing device and a discharging device together with a batchmeter forcontrolling the o eration of the discharging device, a power riving unitcomprising a normally constantly rotating part, driving gearing, aclutch for connect ing said constantly driven part to the gearing, aclutch lever, a sprin tending to move said clutch lever to engage t eclutch, a detent for normally holding the clutch disengaged and aconnection between the batchmeter and said detent for releasing thelatter at a predetermined time, a manual device on the power unit, aknockout member operable thereby to releasethe detent, and means suchthat the knockout member is inactive to release the detent when thebatchmeter has been set and is controlling the detent accordingto afixed period of-time of mixing.

In a concrete paving machine, com- PIlSlIlg a concrete mixer, a chargingdevice and a discharging device, together with a batchmeter forcontrolling the o eration of g the discharging device, a power rivingunit comprising a normally constantly rotating part, driving caring, aclutch for connecting said constant y driven part to the gearing,

a clutch lever, a spring tendin to move said clutch lever to'engage theclutci, a detent for normally holding the clutch disengaged, and aconnection between the batchmeter .and said detent for releasing thelatter at a predeterminedtime, a manual device on the power unit, aknockout member operable thereby to release the detent, and means suchthat the knockout member is inactive to release the detent when thebatchmeter has been set and is controlling the detent according to afixed period of time of mixin a separate means on the power unit operaly connected with the char ing device to be actuated thereby at apredetermined time, a knockout membercarried by said separate means forreleasing the' detent from the clutch lever, and means to render thelast mentioned knockout member inactive when the batchmeter is set asabove. described.

27. Inaconcrete pavin machine, comprising a concrete mixer, a c argingdevice and a ischarging device to ether with a batchmeter forcontrolling the operation of the discharging device, a power drivingunit comprislng a normally constantly rotating part, driving gearing, aclutch for connecting said constantly driven part to the gearing, aclutch lever, a spring tending to move said clutch lever to engage theclutch, a detent for normally holding the clutch disengaged, and aconnection between the batchmeter and said detent for releasing thelatter at a predetermined time, a manual device on the power unit, aknockout member operable thereby to release the detent, and means suchthat the knockout member is inactive to release the detent when thebatchmeter has been set and is 'controllin the detent according to afixed period 0 time of mixing, a separate means on the power unitoperably connected with the charging device to be actuated thereby at apredetermined time, a knockout member carried by said separate means forreleasing the detent from the clutch lever, and means to render the lastmentioned knockout member inactive when the batchmeter is set as abovedescribed, and still other means for manually incapacitatin thebatchmeter connection to the power unit to prevent it from releasingthe-detent so as to thereby prevent the discharge device from beingoperated by the action of the batchmeter.

28. In a paving machine, in combination,

a concrete mixer, a dischargin device there-. -for, a charglng devicethere or, a hoistlng lever for the o ration of the charging device 'aower rivin unit connections be- -lever, and a second manual devicecooperative with the first manual device to prevent the operation of thelatter for rendering said connections active.

30. A mixer, means whereby to discharge the mixer and means for chargingthe mixer, the power discharge unit cooperative with the discharge meansaforesaid, automatic control mechanism for causing operation of thedischarge means, manual means for causing action of the discharge meansto move it into and out of operative positions for discharging at willand as many times as desired, and an instrumentality for preventin theactionv of the manual means aforesai when the discharging means is underthe control of the automatic means. I

31. A mixer, means whereby to discharge the mixer and means for chargingthe mixer, the power discharge unit cooperative with the discharge meansaforesaid, automatic control mechanism for causing operation of thedischarge means, manual means for causing action of the discharge meansto move it into and out of operative positions for discharging at willand as many times as desired, and an instrumentality for preventin theaction of the manual means aforesai when the discharging means is underthe control of the automatic means, the said automatic means including asignal to indicate the time of completion of a lapsed-period of mixing.

32. A mixer, means whereby to discharge the mixer and means for chargingthe mixer, the power discharge unit cooperative with tion of the meansfor discharging the mixer in an automatic manner a manual control soconnected with the said power discharge unit that after the timingdevice has been actuated, the ower dischar unit ma be controlled todlscharge a portion or all 0 the batch from the mixer.

34. In a paving machine, in combination, a concrete mixer, a dischargedevice therefor, a charging device therefor, a single power drivingunit, means for automatically, and means for independently manuallycausing actuation of the power unit, means connecting the said unit tooperate the discharging device, connections leading from the unit forthe operation of the chargin device, and manual means for rendering t epower unit inoperative with respect to the automatic actuating means topermit manual control at will thereof. In testimony whereof I aflix mysi EMIL L. TRA AAS.

ature.

the discharge means aforesaid, automatic control mechanism for causingoperation of the d1scharge means, manual means for causing action of thedischarge means to move it into and out of operative positions fordisfcharging at will and as many times 'as desired, and an instrumentalityfor preventin the action of the manual means aforesai when thedischarging means is under the control of the automatic means, the saidautomatic means including a signal to indicate the time of completion ofa la sed period of mixing, and a manual device or preventing thedischarging means from becoming operative when the signal is operated.

\ 33. In ama'chine of the class described, in combination,a mixercomprising instrumentalities for causing discharge actionthereof andmeans for charging the same, a timing device under the control of thecharging means for timing the period of mixing operation, a powerdischarge unit associated with the timing device and adapted to beplaced in operation thereby for causing ac-

